Answer
$z^{2}-36$
Work Step by Step
From Page 301, we know that the product of a sum and difference of two terms $x$ and $y$ is given by the following equation: $(x+y)(x-y)=x^{2}-y^{2}$.
Therefore, $(z+6)(z-6)=z^{2}-6^{2}=z^{2}-36$.
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